CN114131291A - Integral replacement method for deformation and cracking of middle section of iron-making blast furnace body - Google Patents
Integral replacement method for deformation and cracking of middle section of iron-making blast furnace body Download PDFInfo
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- CN114131291A CN114131291A CN202111343648.5A CN202111343648A CN114131291A CN 114131291 A CN114131291 A CN 114131291A CN 202111343648 A CN202111343648 A CN 202111343648A CN 114131291 A CN114131291 A CN 114131291A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005336 cracking Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- 238000003466 welding Methods 0.000 claims abstract description 41
- 238000010276 construction Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 21
- 238000005520 cutting process Methods 0.000 claims description 17
- 239000002699 waste material Substances 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000010485 coping Effects 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of maintenance of an iron-making blast furnace body, and discloses a deformation and cracking integral replacement method for a middle section of the iron-making blast furnace body, which aims to solve the technical problems existing in the replacement of the middle section of the blast furnace body in the prior art. The reconstruction of the blast furnace body structure is realized, the sinking of the blast furnace body is thoroughly eliminated, the danger that furnace top equipment is stretched and frequently cracked is further avoided, and the deviation and the inclination of a furnace top steel ring caused by the deformation of the furnace body are thoroughly eliminated. The invention provides powerful guarantee for the field processing, the coping and the clearance adjustment of the weld groove between the furnace shell at the upper part of the furnace body and a new furnace shell through supporting and jacking, thereby ensuring the welding quality of the weld, integrally ensuring the construction quality of the blast furnace, realizing the maximum guarantee of the construction quality and the service life of the blast furnace after the major and middle maintenance of the blast furnace from 'old to new'.
Description
Technical Field
The invention relates to the technical field of maintenance of an iron-making blast furnace body, in particular to a method for integrally replacing a middle section of the iron-making blast furnace body by deformation and cracking.
Background
In the production process of the iron-making blast furnace, because of the influence of factors such as smelting mode, structural form of a furnace shell of the blast furnace or insufficient cooling capacity of the furnace shell. The condition that a cooling facility (cooling wall) in a furnace body middle section is damaged in a large area often appears, after the cooling wall is damaged in a large area, the furnace interior glowing furnace burden is in direct contact with a furnace shell, at the moment, the furnace is cooled and protected by water pumping outside the furnace, and under the influence of large temperature difference (400 ℃ -800 ℃), a corresponding furnace shell steel structure is cracked and deformed, so that gas in the furnace is leaked, the top of the furnace body sinks, furnace top equipment is also leaked or broken due to stretching, the content of the gas on the furnace body is seriously overproof, and the normal production operation of the blast furnace can not be directly caused. At this time, the upper and lower portions (hearth) of the furnace body are often in good condition.
Under the condition, if the whole furnace body is dismantled and rebuilt, the construction period is long, the waste is large, and therefore the method which adopts the maintenance mode of replacing the middle section of the furnace body is the most economic method and the shortest construction period. The conventional construction method is that furnace shells are replaced in blocks, and then cooling walls are installed, and the method is rarely adopted due to the fact that welded junctions are concentrated in stress and long in construction period. The other method is to fixedly support the upper section of the furnace body, the method overcomes the defect of replacing the furnace shell in blocks, but cannot realize the restoration of the furnace body structure and cannot recover the elevation and the levelness of the furnace throat steel ring, and the prior art cannot solve the technical problems.
Disclosure of Invention
The invention aims to solve the technical problems in the replacement of the middle section of the blast furnace body in the prior art, and provides an integral replacement method for deformation and cracking of the middle section of the blast furnace body.
In order to achieve the purpose, the invention adopts the following technical scheme:
1) determining the position and the number of the furnace body which needs to be integrally replaced, calculating the weight and the overall dimension of the worn section (1) at the upper part of the furnace body, and determining furnace top spare parts connected with the furnace body;
2) processing a new cooling wall and a new furnace shell, and when a new furnace shell with a final zone connected with an old section at the upper part of the furnace body is processed, adding an allowance for the design height for the height of the new furnace shell with the final zone;
3) after the blast furnace stops blowing and the charge level falls, mounting supporting and jacking steel structure frames at the furnace body frames at two sides of the waste section at the upper part of the furnace body, and fixing a supporting seat on the waste section at the upper part of the furnace body;
4) the removal of the cooling wall at the middle replacement section of the furnace body and the cutting of the water cooling pipeline outside the furnace are completed; and the process pipeline connected with the upper part of the worn section at the upper part of the furnace body is dismantled;
5) a synchronous hydraulic jack is arranged between the supporting jacking steel structure frame and the supporting seat, and a waste section at the upper part of the furnace body is pre-jacked, wherein the pre-jacking force is 1.2 times of the weight of the waste section at the upper part of the furnace body;
6) measuring the elevation and the upper surface horizontal deviation of the top furnace throat steel ring of the upper worn section of the furnace body, determining the sinking amount and the tilting amount of the current furnace throat steel ring generated by the deformation of the furnace body structure, marking points on a furnace top frame on the same plane with the furnace throat steel ring, and determining the position relation of the current furnace throat steel ring relative to the furnace top frame;
7) cutting and separating the mounting welding line between the old section at the upper part of the furnace body and the replacement section at the middle part of the furnace body;
8) operating a hydraulic jack, continuing to lift up the old section at the upper part of the furnace body, wherein the lifting amount is the allowance amount in the height of the new furnace shell of the final belt plus 40-50 mm, then installing a protective buttress, supporting a steel base plate at the top of the protective buttress, ensuring that a gap is reserved between the steel base plate and a supporting seat, and then operating the hydraulic jack to fall back to enable the protective buttress to bear the load which reaches 80% of the lifting load;
9) removing all furnace shells of the furnace body middle replacement section and cleaning joints between the furnace body lower worn section and the furnace body middle replacement section;
10) then installing a new furnace shell of the replacement section in the middle of the furnace body, adjusting the central line of the furnace body band by band until all furnace shells are completely installed, and welding all furnace shell welding seams except the circumferential seam on the new furnace shell which is finally provided with the new furnace shell;
11) cutting and adjusting the allowance in the height of the new furnace shell of the final belt, so that the clearance between the furnace shells of the old section at the upper part of the furnace body and the replacement section at the middle part of the furnace body is the actually measured elevation-designed elevation- (3 mm-5 mm) of the furnace throat steel ring;
12) according to the processing requirement of the connecting ring welding seam between the furnace shells, the groove between the new furnace shell and the old section at the upper part of the furnace body is subjected to polishing at the end of thermal cutting;
13) operating the hydraulic jack to lift by 10mm, then removing all the protection buttresses, and supporting a steel backing plate;
14) and then, welding the welding seam between the new furnace shell in the final zone and the furnace shell at the old section at the upper part of the furnace body is completed, then nondestructive detection of the welding seam is carried out, and the steel structure frame and the supporting seat are removed and supported after the welding seam is qualified.
15) And then, the installation, welding and piping of the cooling wall of the middle replacement section of the furnace body are completed, the replacement construction of the middle replacement section of the whole furnace body is completed, and the process pipeline on the waste section at the upper part of the furnace body is connected.
Further, in the step 1), the position and the number of the furnace body needing to be integrally replaced are determined according to the deformation and cracking condition of the furnace body of the blast furnace, the damage degree of the cooling wall in the furnace, the elevation of the steel ring at the top of the furnace and the change degree of the horizontal displacement.
Further, the allowance of the new furnace shell in the final zone in the step 2) is the width of the circumferential weld of the furnace shell which is +2 times of the difference between the steel ring of the detected furnace throat and the designed elevation after the furnace is shut down.
Further, the lifting amount of the synchronous hydraulic jack in the step 5) is the allowance of the height of the final new furnace shell plus 50-60 mm.
Further, in the step 8), the gap between the steel base plate and the supporting seat is 5 mm-10 mm, and after the measurement confirms that the distance deviation between the upper plane of the steel base plate and the lower plane of the supporting seat at each supporting point is less than 1 mm, the hydraulic jack is operated to fall back.
Further, in the step 9), the joint between the worn section at the lower part of the furnace body and the replacement section at the middle part of the furnace body is cleaned, the furnace body is subjected to hot cutting, each part is positioned on the same horizontal plane, the horizontal deviation is not more than 2 mm, then the surface and the inner side and the outer side of the furnace body are polished smoothly according to the welding requirement, and more than 85% of the surface is ensured to expose the metallic luster.
Further, in the step 12), after the groove is polished, guide plates are uniformly arranged on the upper edge of the new furnace shell in the final belt at intervals of 1-1.5 meters, and the thickness of each guide plate is not less than 0.6 time of the thickness of the furnace shell.
Further, in the step 13), a hydraulic jack is used for falling back and lifting for multiple times, the falling back is ensured each time that a gap of 3-5 mm is formed between a cylinder head of the hydraulic jack and the lower plane of the supporting seat, and a furnace shell at the worn section of the upper part of the furnace body is separated from the guide plate during lifting; and in the process of repeatedly lifting and falling by the hydraulic jack, the displacement between the central point of the furnace throat steel ring and the central line of the furnace body and the horizontal deviation of the plane on the furnace throat steel ring are checked, and the thickness of the welding groove adjusting shim plate for finally adjusting the new furnace shell and the old furnace shell at the upper part of the furnace body is calculated until the displacement between the central point of the furnace throat steel ring and the central line of the furnace body and the horizontal deviation of the plane on the furnace throat steel ring are better than the design requirements.
Further, in the step 14), assembling the new furnace shell of the final belt and the furnace shell of the old section at the upper part of the furnace body, and completing welding of the assembly welding line.
Compared with the prior art, the invention has the following beneficial effects:
the invention fully utilizes the blast furnace frame and the large-tonnage electric synchronous hydraulic jack jacking control system of the frame type blast furnace which are commonly adopted at present, fully considers the difference between the furnace body structure at the later stage of the furnace service and the original design, and realizes the whole replacement of the deformation and cracking of the middle section of the blast furnace body safely, high-quality and high-efficiently by comprehensively considering various aspects such as loss compensation, construction safety, construction benefit, construction quality guarantee and the like and by assisting the corresponding operation mode and construction method, so that the maintained blast furnace body and the furnace top structure are restored to the original design state. Through the implementation of the invention, the reconstruction of the blast furnace body structure is realized, and the invention can thoroughly eliminate the sinking of the blast furnace body and further avoid the danger of frequent cracking of furnace top equipment under tension.
When the support jacking device is used for supporting and jacking, the deflection and inclination of the steel ring of the furnace top caused by the deformation of the furnace body are thoroughly eliminated through the setting of proper parameters. The invention provides powerful guarantee for the field processing, the coping and the clearance adjustment of the weld groove between the furnace shell at the upper part of the furnace body and a new furnace shell through supporting and jacking, thereby ensuring the welding quality of the weld, integrally ensuring the construction quality of the blast furnace, realizing the maximum guarantee of the construction quality and the service life of the blast furnace after the major and middle maintenance of the blast furnace from 'old to new'.
Drawings
FIG. 1 is a front view of an overall schematic view of an iron-making blast furnace body according to the present invention.
FIG. 2 is a schematic view of the body of the blast furnace of the present invention.
FIG. 3 is a schematic view of a supporting structure according to the present invention.
FIG. 4 is a schematic view of the furnace with the middle section removed in accordance with the present invention.
FIG. 5 is a view showing the installation of the new furnace shell of the present invention.
Fig. 6 is an enlarged view of the new and old furnace shell installation adjustment position of fig. 5.
The reference numerals have the following meanings: 1. the upper part of the furnace body is a waste section; 2. a distributing device; 3. a lower sealing valve; 4. a stock rod (flange); 5. an ascending pipe; 6. an expansion joint; 7. a new stave cooler; 8. a new furnace shell; 9. a furnace body middle replacement section; 10. finally, taking a new furnace shell; 11. steel ring at the back of the furnace; 12. supporting and jacking the steel structure frame; 13. a supporting seat; 14. a water cooling pipeline outside the furnace; 15. a synchronous hydraulic jack; 16. installing a welding seam; 17. a household pier; 18. a steel backing plate; 19. the lower part of the furnace body is a waste section; 20. a guide plate; 21. welding a groove adjusting backing plate; 22. a furnace mouth frame.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in figures 1-6, a method for integrally replacing the middle section of the body of an iron-making blast furnace with deformation and cracking is characterized by comprising the following steps:
1) according to the deformation and cracking condition of the blast furnace body, the damage degree of the cooling wall in the furnace, the elevation of the steel ring 11 on the furnace top and the change degree of horizontal displacement, the position and the number of the furnace body needing to be integrally replaced are determined, the weight and the overall dimension of the worn section 1 on the upper part of the furnace body are calculated, and the spare parts on the furnace top connected with the furnace body are determined.
2) And (3) processing a new cooling wall and a new furnace shell, and when a new furnace shell 10 with a final zone connected with the worn section 1 at the upper part of the furnace body is processed, the height of the new furnace shell 10 with the final zone is the design height plus allowance. The allowance of the new furnace shell 10 in the final zone is the furnace shell girth weld width (determined according to the field measurement result) which is +2 times of the difference between the detected furnace throat steel ring 11 and the designed elevation after furnace shutdown.
3) After the blast furnace stops at the blowing-down and charge level lowering stage, supporting and jacking steel structure frames 12 are arranged at the furnace body frames at two sides of the waste section 1 at the upper part of the furnace body, and a supporting seat 13 is fixed on the waste section 1 at the upper part of the furnace body. The supporting and jacking steel structural frame 12 comprises a supporting frame body horizontally installed with the furnace body frame 22 and an inclined supporting frame obliquely installed on the furnace body frame 22.
4) And the removal of the cooling wall of the replacement section 9 in the middle of the furnace body and the cutting of the water cooling pipeline 14 outside the furnace are completed. In the construction process, a movable hanging scaffold for construction in the furnace is arranged through a trial rod 4 flange, after the distributing device 2 and the throttling lower sealing valve 3 are removed, a hoisting facility for construction is arranged above a furnace throat steel ring 11, and an expansion joint 6 on an ascending pipeline is removed, so that the connection and removal of the furnace shell and a process pipeline are realized.
5) And a synchronous hydraulic jack 15 is arranged between the supporting and jacking steel structure frame 12 and the supporting seat 13, and pre-jacking is carried out on the old section 1 at the upper part of the furnace body, wherein the pre-jacking force is 1.2 times of the weight of the old section 1 at the upper part of the furnace body.
6) The elevation and the upper surface horizontal deviation of the furnace throat steel ring 11 at the top of the upper worn section 1 of the furnace body are measured, the sinking amount and the tilting amount of the current furnace throat steel ring 11, which are generated due to the deformation of the furnace body structure, are determined by comparing the design elevation of the furnace throat steel ring 11, mark points are made on the furnace top frame on the same plane with the furnace throat steel ring 11, and the position relation of the current furnace throat steel ring 11 relative to the furnace top frame is determined.
7) And cutting and separating the original furnace shell inter-belt installation welding line 16 between the worn section 1 at the upper part of the furnace body and the replacement section 9 at the middle part of the furnace body by using a thermal cutting tool. At this time, the pre-jacking force of the large-tonnage synchronous electro-hydraulic jack 15 is observed to gradually decline until the pre-jacking force is stable. Checking to confirm that the worn section 1 at the upper part of the furnace body is completely separated from the surrounding structure, and the lifting amount of the hydraulic jack 15 is the allowance in the height of the new furnace shell 10 in the final zone plus 50-60 mm.
8) And operating the hydraulic jack 15, continuing to lift the worn section 1 at the upper part of the furnace body, wherein the lifting amount is the allowance amount in the height of the new furnace shell 10 in the final zone plus 40-50 mm, then installing the protection buttress 17, supporting a steel backing plate 18 at the top of the protection buttress 17, wherein the gap between the steel backing plate 18 and the supporting seat 13 is 5-10 mm, and after measuring and confirming that the distance deviation between the upper plane of the steel backing plate 18 at each supporting point and the lower plane of the supporting seat 13 is less than 1 mm, operating the hydraulic jack 15 to fall back to enable the bearing capacity of the protection buttress 17 to reach 80% of the lifting load.
9) And removing all furnace shells of the furnace body middle replacing section 9, cleaning a joint between the furnace body lower worn section 19 and the furnace body middle replacing section 9, carrying out hot cutting on the furnace body lower worn section and the furnace body middle replacing section to ensure that each part is positioned on the same horizontal plane, the horizontal deviation is not more than 2 mm, and then polishing the surface and the inner side and the outer side of the furnace body lower worn section smoothly according to welding requirements to ensure that more than 85% of the surface is exposed with metallic luster.
10) And then installing a new furnace shell of the middle replacement section 9 of the furnace body, adjusting the central line of the furnace body band by band until all furnace shells are completely installed, and welding all furnace shell welding seams except the upper seam of the new furnace shell 10 which is finally provided with the new furnace shell.
11) Cutting and adjusting the allowance in the height of the new furnace shell 10 at the end of the cutting and adjusting so that the gap between the furnace shell of the old section 1 at the upper part of the furnace body and the furnace shell of the replacement section 9 at the middle part of the furnace body is the actually measured elevation-designed elevation- (3 mm-5 mm) of the furnace throat steel ring 11, and finely adjusting the gap according to the horizontal deviation value of the upper plane of the furnace throat steel ring 11.
12) According to the processing requirement of the welding seams of the connecting rings between the furnace shells, the groove between the new furnace shell 10 and the old section 1 at the upper part of the furnace body is cut and polished at the end of thermal cutting. After the groove is polished, installing guide plates 20 on the upper edge of a new furnace shell 10 in the final belt at intervals of 1-1.5 m in a spot welding mode, wherein the thickness of each guide plate 20 is not less than 0.6 time of the thickness of the furnace shell.
13) The hydraulic jack 15 is operated to lift 10mm, then all the protection buttresses 17 are dismantled, and the steel backing plate 18 is supported. The hydraulic jack 15 falls back and rises for multiple times, the falling back ensures that a gap of 3-5 mm is formed between the cylinder head of the hydraulic jack 15 and the lower plane of the supporting seat 13 every time, and the furnace shell of the worn section 1 at the upper part of the furnace body is separated from the guide plate 20 during rising; and in the process of repeatedly lifting and falling the hydraulic jack 15, the displacement between the central point of the furnace throat steel ring 11 and the central line of the furnace body and the horizontal deviation of the upper plane of the furnace throat steel ring 11 are checked, the thickness of the welding groove adjusting backing plate 21 of the new furnace shell 10 and the furnace shell of the old section 1 at the upper part of the furnace body is calculated and adjusted finally until the displacement between the central point of the furnace throat steel ring 11 and the central line of the furnace body and the horizontal deviation of the upper plane of the furnace throat steel ring 11 are better than the design requirements.
14) And then assembling the new furnace shell 10 at the final zone and the furnace shell of the old section 1 at the upper part of the furnace body, and finishing the welding of the assembly welding line. The guide plate 20 is removed when welded to the backing plate. And then carrying out nondestructive detection on the welding line, and removing, cleaning, supporting and jacking the steel structure frame 12 and the supporting seat 13 after the welding line is qualified.
15) And then, the installation, welding and piping of the cooling wall of the middle replacing section 9 of the furnace body are completed, the replacing construction of the middle replacing section 9 of the whole furnace body is completed, and the process pipeline on the worn section 1 at the upper part of the furnace body is well connected.
Claims (9)
1. A method for integrally replacing the deformation and cracking of the middle section of an iron-making blast furnace body is characterized by comprising the following steps:
1) determining the position and the number of the furnace body which needs to be integrally replaced, calculating the weight and the overall dimension of the worn section (1) at the upper part of the furnace body, and determining furnace top spare parts connected with the furnace body;
2) processing a new cooling wall and a new furnace shell, and when a new furnace shell (10) with a final zone connected with the worn section (1) at the upper part of the furnace body is processed, the height of the new furnace shell (10) with the final zone is the design height plus allowance;
3) after the blast furnace stops at the blowing-down and charge level lowering state, mounting supporting and jacking steel structure frames (12) at the furnace body frames at two sides of the waste section (1) at the upper part of the furnace body, and fixing a supporting seat (13) on the waste section (1) at the upper part of the furnace body;
4) the removal of the cooling wall of the replacement section (9) in the middle of the furnace body and the cutting of the water cooling pipeline (14) outside the furnace are completed; and the process pipeline connected with the upper part of the worn section (1) at the upper part of the furnace body is dismantled;
5) a synchronous hydraulic jack (15) is arranged between the supporting and jacking steel structure frame (12) and the supporting seat (13), and the upper worn section (1) of the furnace body is pre-jacked, wherein the pre-jacking force is 1.2 times of the weight of the upper worn section (1) of the furnace body;
6) measuring the elevation and the upper surface horizontal deviation of a furnace throat steel ring (11) at the top of a waste section (1) at the upper part of the furnace body, determining the sinking amount and the tilting amount of the current furnace throat steel ring (11) caused by the structural deformation of the furnace body, marking points on a furnace top frame on the same plane with the furnace throat steel ring (11), and determining the position relation of the current furnace throat steel ring (11) relative to the furnace top frame;
7) cutting and separating an installation welding seam (16) between original furnace shell belts between the worn section (1) at the upper part of the furnace body and the replacement section (9) at the middle part of the furnace body;
8) operating a hydraulic jack (15), continuing to jack the old section (1) at the upper part of the furnace body, wherein the jacking amount is the allowance amount in the height of the new furnace shell (10) in the final zone plus 40-50 mm, then installing a protection buttress (17), supporting a steel base plate (18) at the top of the protection buttress (17), ensuring that a gap is reserved between the steel base plate (18) and a supporting seat (13), and then operating the hydraulic jack (15) to fall back to enable the protection buttress (17) to bear the load reaching 80% of the jacking load;
9) removing all furnace shells of the furnace body middle replacing section (9) and cleaning the joint between the furnace body lower worn section (19) and the furnace body middle replacing section (9);
10) then installing a new furnace shell of the replacement section (9) in the middle of the furnace body, adjusting the center line of the furnace body band by band until all furnace shells are completely installed, and welding all furnace shell welding seams except the ring seam on the new furnace shell (10) which is finally provided with the new furnace shell;
11) cutting and adjusting the allowance in the height of the new furnace shell (10) at the end of the adjustment to ensure that the clearance between the old section (1) at the upper part of the furnace body and the furnace shell at the replacement section (9) at the middle part of the furnace body is the actually measured elevation-design elevation- (3 mm-5 mm) of the furnace throat steel ring (11);
12) according to the processing requirements of the welding seams of the connecting rings between the furnace shells, the groove between the new furnace shell (10) and the old section (1) at the upper part of the furnace body is polished after the thermal cutting;
13) operating a hydraulic jack (15) to lift by 10mm, then removing all the protection buttresses (17) and padding a steel base plate (18);
14) then, welding the welding seam between the new furnace shell (10) in the final zone and the furnace shell of the old section (1) at the upper part of the furnace body is completed, then nondestructive detection of the welding seam is carried out, and the steel structure frame (12) and the supporting seat (13) are removed, cleaned and supported after the welding seam is qualified;
15) and then, the installation, welding and piping of the cooling wall of the middle replacing section (9) of the furnace body are completed, the replacing construction of the middle replacing section (9) of the whole furnace body is completed, and the process pipeline on the worn section (1) at the upper part of the furnace body is connected.
2. The method of claim 1 for integrally replacing the intermediate section of the body of the iron-making blast furnace by deformation and cracking, wherein the method comprises the following steps: and in the step 1), determining the position and the number of the furnace bodies needing to be integrally replaced according to the deformation and cracking conditions of the furnace bodies of the blast furnace, the damage degree of the cooling walls in the furnace, the elevation of the steel ring (11) at the furnace top and the change degree of the horizontal displacement.
3. The method of claim 1 for integrally replacing the intermediate section of the body of the iron-making blast furnace by deformation and cracking, wherein the method comprises the following steps: and the margin of the new furnace shell (10) in the step 2) is the furnace shell girth weld width which is +2 times of the difference between the detected furnace throat steel ring (11) and the designed elevation after the furnace is shut down.
4. The method of claim 3 for integrally replacing the intermediate section of the iron-making blast furnace body by deformation and cracking, wherein the method comprises the following steps: and the lifting amount of the synchronous hydraulic jack (15) in the step 5) is the allowance amount in the height of the new furnace shell (10) in the final belt plus 50-60 mm.
5. The method of claim 1 for integrally replacing the intermediate section of the body of the iron-making blast furnace by deformation and cracking, wherein the method comprises the following steps: and 8) measuring and confirming that the distance deviation between the upper plane of the steel base plate (18) and the lower plane of the supporting seat (13) at each supporting point is less than 1 mm after the gap between the steel base plate (18) and the supporting seat (13) in the step 8) is 5-10 mm, and operating the hydraulic jack (15) to fall back.
6. The method of claim 1 for integrally replacing the intermediate section of the body of the iron-making blast furnace by deformation and cracking, wherein the method comprises the following steps: and 9), cleaning the joint between the worn section (19) at the lower part of the furnace body and the replacement section (9) at the middle part of the furnace body, carrying out hot cutting on the joint to ensure that each part is positioned on the same horizontal plane and the horizontal deviation is not more than 2 mm, and then polishing the surface and the inner side and the outer side smoothly according to the welding requirement to ensure that more than 85% of the surface is exposed with metallic luster.
7. The method of claim 6, wherein the method comprises the following steps: in the step 12), after the groove is polished, guide plates (20) are uniformly arranged on the upper edge of the final new furnace shell (10) at intervals of 1-1.5 m, and the thickness of each guide plate (20) is not less than 0.6 time of the thickness of the furnace shell.
8. The method of claim 7 for integrally replacing the intermediate section of the body of the iron-making blast furnace by deformation and cracking, wherein the method comprises the following steps: in the step 13), the hydraulic jack (15) is made to fall back and rise for multiple times, the falling back ensures that a gap of 3-5 mm is formed between the cylinder head of the hydraulic jack (15) and the lower plane of the supporting seat (13) every time, and the furnace shell of the worn section (1) at the upper part of the furnace body is separated from the guide plate (20) during rising; and in the process of repeatedly lifting and falling of the hydraulic jack (15), the displacement between the central point of the furnace throat steel ring (11) and the central line of the furnace body and the horizontal deviation of the upper plane of the furnace throat steel ring (11) are checked, the thickness of a welding groove adjusting backing plate (21) of a new furnace shell (10) and a furnace shell of the old section (1) at the upper part of the furnace body is calculated and adjusted finally, until the displacement between the central point of the furnace throat steel ring (11) and the central line of the furnace body and the horizontal deviation of the upper plane of the furnace throat steel ring (11) are checked to be superior to the design requirements.
9. The method of claim 8 for integrally replacing the intermediate section of the body of the iron-making blast furnace by deformation and cracking, wherein the method comprises the following steps: in the step 14), assembling the furnace shell (10) with the new furnace shell and the furnace shell of the old section (1) at the upper part of the furnace body to complete welding of the assembly weld.
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| CN111235333A (en) * | 2020-03-11 | 2020-06-05 | 湖南湘钢工程技术有限公司 | Method for replacing furnace shell of blast furnace body part |
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| JPH11189815A (en) * | 1997-12-24 | 1999-07-13 | Nkk Corp | Working method of exchanging of stave in blast furnace |
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